Java Tutorial/XML/XML Schema

Create XML validator from XML schema

import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;
public class Main {
  public static void main(String[] argv) throws Exception {
    String schemaLang = "http://www.w3.org/2001/XMLSchema";
    SchemaFactory factory = SchemaFactory.newInstance(schemaLang);
    Schema schema = factory.newSchema(new StreamSource("sample.xsd"));
    Validator validator = schema.newValidator();
    validator.validate(new StreamSource("sample.xml"));
  }
}

JAXP 1.3 Datatype API

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import javax.xml.datatype.DatatypeConfigurationException;
import javax.xml.datatype.DatatypeConstants;
import javax.xml.datatype.DatatypeFactory;
import javax.xml.datatype.Duration;
import javax.xml.datatype.XMLGregorianCalendar;
/**
 * <p>
 * A sample which demonstrates usage of the JAXP 1.3 Datatype API.
 * </p>
 * 
 * @version $Id: DatatypeAPIUsage.java 447685 2006-09-19 02:37:49Z mrglavas $
 */
public class DatatypeAPIUsage {
  public static void main(String[] args) {
    try {
      DatatypeFactory df = DatatypeFactory.newInstance();
      // my work number in milliseconds:
      Duration myPhone = df.newDuration(9054133519l);
      Duration myLife = df.newDuration(true, 29, 2, 15, 13, 45, 0);
      int compareVal = myPhone.rupare(myLife);
      switch (compareVal) {
      case DatatypeConstants.LESSER:
        System.out.println("There are fewer milliseconds in my phone number than my lifespan.");
        break;
      case DatatypeConstants.EQUAL:
        System.out
            .println("The same number of milliseconds are in my phone number and my lifespan.");
        break;
      case DatatypeConstants.GREATER:
        System.out.println("There are more milliseconds in my phone number than my lifespan.");
        break;
      case DatatypeConstants.INDETERMINATE:
        System.out.println("The comparison could not be carried out.");
      }
      // create a yearMonthDuration
      Duration ymDuration = df.newDurationYearMonth("P12Y10M");
      System.out.println("P12Y10M is of type: " + ymDuration.getXMLSchemaType());
      // create a dayTimeDuration (really this time)
      Duration dtDuration = df.newDurationDayTime("P10DT10H12M0S");
      System.out.println("P10DT10H12M0S is of type: " + dtDuration.getXMLSchemaType());
      // try to fool the factory!
      try {
        ymDuration = df.newDurationYearMonth("P12Y10M1D");
      } catch (IllegalArgumentException e) {
        System.out.println(""duration": P12Y10M1D is not "yearMonthDuration"!!!");
      }
      XMLGregorianCalendar xgc = df.newXMLGregorianCalendar();
      xgc.setYear(1975);
      xgc.setMonth(DatatypeConstants.AUGUST);
      xgc.setDay(11);
      xgc.setHour(6);
      xgc.setMinute(44);
      xgc.setSecond(0);
      xgc.setMillisecond(0);
      xgc.setTimezone(5);
      xgc.add(myPhone);
      System.out
          .println("The approximate end of the number of milliseconds in my phone number was "
              + xgc);
      // adding a duration to XMLGregorianCalendar
      xgc.add(myLife);
      System.out.println("Adding the duration myLife to the above calendar:" + xgc);
      // create a new XMLGregorianCalendar using the string format of xgc.
      XMLGregorianCalendar xgcCopy = df.newXMLGregorianCalendar(xgc.toXMLFormat());
      // should be equal-if not what happened!!
      if (xgcCopy.rupare(xgc) != DatatypeConstants.EQUAL) {
        System.out.println("oooops!");
      } else {
        System.out.println("Very good: " + xgc + " is equal to " + xgcCopy);
      }
    } catch (DatatypeConfigurationException dce) {
      System.err.println("error: Datatype error occurred - " + dce.getMessage());
      dce.printStackTrace(System.err);
    }
  } // main(String[])
} // DatatypeAPIUsage